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Dielectric Based Accelerator Collaboration Program

CLIC’09 Workshop, CERN Oct 12-16, 2009. Dielectric Based Accelerator Collaboration Program Euclid Techlabs and Accelerator R&D, HEP, ANL. A.Kanareykin Euclid TechLabs LLC, Rockville, MD. This work is supported by the DOE, High Energy Physics. Euclid Techlabs. www.hep.anl.gov/awa.

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Dielectric Based Accelerator Collaboration Program

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  1. CLIC’09 Workshop, CERN Oct 12-16, 2009 Dielectric Based Accelerator Collaboration Program Euclid Techlabs and Accelerator R&D, HEP, ANL A.Kanareykin Euclid TechLabs LLC, Rockville, MD This work is supported by the DOE, High Energy Physics

  2. Euclid Techlabs www.hep.anl.gov/awa www.beamphysics.com Euclid TechLabs LLC, founded in 1999 (as Euclid Concepts LLC) is a company specializing in the development of advanced dielectric materials for particle accelerator and other microwave applications. Additional areas of expertise include theoretical electromagnetics; dielectric structure based accelerator development; superconducting accelerating structure design; "smart" materials technology and applications; and reconfigurable computing. Euclid and the Argonne Wakefield Accelerator group at ANL have a long history of successful collaboration in engineering development and experimental demonstration of high gradient acceleration using a number of different dielectric structures and electron beam configurations. 2009 – 8 Phase II SBIR granted, 7 people research staff (5 full time and 2 visiting), + AWA group support, + cooperation with ANL/FNAL/Yale University/other labs…

  3. Motivation/Outline MW DLA issues: high gradient – drive beam, power extraction, tuning, efficiency, beam control (BBU). • Drive Beam – Beam Train - High Gradient DLA • Material Sustaining High Gradient (Quartz? Diamond?) • Dielectric - Wakefield Power Extractor • Tunable Dielectric Based Accelerator • Energy Transfer: High Transformer Ratio • Beam Handling, Beam Breakup (BBU) • Multilayer structure – High r/Q.

  4. Current SBIR Funded Program, Phase II Funded previously: • Transformer Ratio Experiment – Phase II (2002-2006) • BST Ferroelectric Development – Phase II (2005-2007) • SC Traveling Wave Accelerating Structure, Phase II (2007-2009) • New Coupler Design for the DLA Structure, Phase II (2007-2009) • Active Media Development – Phase II, (2006-2008 • Funded, and in progress now: • Diamond Based DLA Structure, Phase II (2009-2011) - new • Tunable DLA Structure, Phase II (2008-2010) • Beam Break-Up (BBU) of the DLA Structure (2008-2010 • 26 GHz DLA Based Power Extractor (2008-2010)

  5. Motivation for CVD Diamond for DLA • CVD DIAMOND PROPERTIES: • - RF BREAKDOWN THRESHOLD OF ~ 2 GV/m • LOSS FACTOR DOWN TO 5x10-5 AT 30-140 GHz • HIGHESTTHERMAL CONDUCTIVITY • MULTIPACTING CAN BE SUPPRESSED (NEW !) • and • CVD DEPOSITION NOW CAN BE USED TO FORM CYLINDRICAL WAVEGUIDES

  6. 35 GHz Diamond Based DLA Structure CVD diamond tube fabrication

  7. Update on 26GHz Dielectric-Based Power Extractor *16, 20nC bunch train, steady output power of 148 MW and 56 MV/m peak gradient. The energy loss is 5.7 MeV for the last bunch in the bunch train . *20nC, single bunch, bunch length 1.5mm.

  8. Fabrication 26GHz dielectric-based PE 26GHz UHV rf power detector SiC based 26GHz UHV rf load

  9. Beam Test Setup Load Rf probe 16GHz scope 11.424GHz BPF (228MHz BW) LO=14.576GHz

  10. Result (I): 16 bunches, Tb=769ps Down-converted rf Trace SiC based Rf load behaves well. 11.44+14.576=26.016 GHz

  11. Result (II): 4 bunches, Tb=769ps Down-converted rf Trace SiC based RF load works well. Background noise to the scope 11.44+14.576=26.016 GHz

  12. Result (III): Charge sweeping, 4 bunches, Tb=769ps 29.6MW • BBU observed when beam current is high. • Designing the beam control magnet (quartz channel) to push the high current transportation. • Designing transverse mode damped power extractor. *Number is the percentage of charge transmission out of the structure.

  13. BBU and High Order Mode Damping - Deflection of bunch tail by transverse wakefields from head - Amplification of injection errors as beam propagates - Especially significant for the high charge bunches used for wakefield acceleration - Not controlled using Chojnacki mode suppressor

  14. BBU Code Development Focusing quads (in this case in the x-x’ plane) are plotted with a solid blue line. Defocusing quadrupoles are shown with a solid red line. Cross-section view (x-y plane), Gaussian distribution

  15. Example of BBU-3000 calculation of time evolution of BBU in a 26 GHz dielectric waveguide Phase space X distribution

  16. Power Extractor and Bunch Train Beam Dynamics Simulations Relative intensity loss of a single bunch propagating through the 26 GHz power extractor.

  17. 26GHz decelerator, five bunch train computed using BBU-3000. Top to bottom, bunches 1-5 at 40ps intervals. Initial offset of 0.4mm in the positive x direction. Distances in cm; vertical extent of each plot corresponds to the width of the vacuum channel (±0.35 cm).

  18. 7.8GHz Transverse Mode Damped DLA Structure A new transverse mode damped DLA structure has been proposed. A 7.8 GHz prototype has been built and bench tested. Beam test will be performed at AWA facility. Collaboration with ANL

  19. 12GHz Dielectric Based Power Extractor Using CLIC Parameters: σz=2mm, Q=8.4nC, Tb=83ps Loss tangent is 1*10^-4 in both calculations.

  20. 12GHz Quartz-Based Power Extractor Using CLIC Parameters: σz=1mm, Q=8.4nC, Tb=83ps

  21. 3-D view of a 15.6GHz dielectric-based PE Dielectric material • A 26GHz dielectric-based power extractor has been developed and beam tested. • We have already completed the EM design for a 15.6GHz dielectric-based power extractor (this is part of the short rf pulse TBA prototype). • The transverse mode damping scheme for the dielectric-based structures has been demonstrated, and this will be added in for the future power extractor design.

  22. SUMMARY • Diamond Based DLA has been developed to be used with the DLA structure intended for >200 MV/m gradient ranges. • Successfully demonstrated the 26GHz, high power rf source using dielectric-based scheme. 30 MW power has been generated. • Beam Breakup effects have been studied, focusing systems based on BBU is being developed. Quad channel currently under design. • Power extractor will be the initial experiment on BBU control. New transverse stage for precise control of the beam is under development. • 12GHz Quartz-Based Power Extractor using CLIC parameters has been proposed.

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